基于子模型的高面板堆石坝周边缝变形分析

Study on Deformation Regularity for Peripheral Joints of High Concrete Faced Rockfill Dam Based on Submodel Method

采用邓肯E-B模型模拟面板堆石坝体时考虑某高面板堆石坝面板分期施工与浇筑的特点,建立准确模拟面板特性的子模型,用接触面单元模拟坝体与面板的接触面及面板缝的相互作用,分析了该高面板堆石坝在稳定期、蓄水期和校核洪水期的面板周边缝变形规律,研究了周边缝随上游水位的变形规律,探究周边缝变形量和坝体整体变形规律,并与类似坝高的面板堆石坝结果进行比较。结果表明,该高面板堆石坝模型在不同时期的周边缝变形符合工程实际,在可接受范围内;靠近河床的面板的垂直缝基本上为受压缝,靠近两岸山体的面板垂直缝为张开缝;周边缝三向位移随上游水位的变化及顺坝轴向呈现一定的规律,与坝体沉降有一定的联系。

Duncan E-B model is used to simulate the rockfill embankment, a submodel is established for the refined simulation of characteristics of concrete face slab by considering the stage construction of a high CFRD. The interface element is employed to simulate the contact surface between dam body and face slab, and between joints of face slab. Deformation regularity for peripheral joints of High CFRD during the stable, impounding and check flood periods are analyzed. With the variation of water level in the upstream deformation regularity and overall deformation of dam for peripheral joints are studied. Compared with the results of the CFRDs with the similar height, it is found out that the deforma- tion for the peripheral joints of the high CFRDs at different periods conform engineering practice, within the acceptable range; vertical fracture of face near the riverbed essentially is compression joints while vertical fracture of face close to both sides of the mountain is open joints; with the variation of water level in the upstream, the setting of dam and cross stake mark deformation regularity for peripheral joints present certain regularity. This paper analyzes the deformation of peripheral joints of high CFRDs to understand the deformation rules of peripheral joints.